When generating polylines from a series of points, I used "Points to Line" tool. From this, Arc generates a polyline feature class, which includes the attribute shape_length. What units are these shape lengths in? I am using the Canada_Albers_Equal_Area_Conic projection, which has the units of meters, but the shape lengths do not appear to be in meters. Any tips?
According to the ArcGIS Help website for a related tool, this field should be in the units of the output coordinate system, which in your case is meters.
When the output is a feature class in a file geodatabase or a personal geodatabase, the values in the Shape_Length field are always in the units of the output coordinate system specified by the Spatial Reference parameter; and they are the planar lengths of the polylines.
If it doesn't appear that they are in meters, try checking your coordinate system properties to see what units your output coordinate system is in.
I just did an example where my output coordinate system units were feet and the Shape_leng field showed up correctly in feet. Did you try adding a field and using the Calculate Geometry tool to show the actual lengths of the line segments in meters? This can help you confirm if your shape_leng units are or are not in meters for sure. Maybe the tool gave you a different line result that you were expecting.